2 * Simple driver for Texas Instruments LM355x LED Flash driver chip
3 * Copyright (C) 2012 Texas Instruments
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/module.h>
11 #include <linux/delay.h>
12 #include <linux/i2c.h>
13 #include <linux/gpio.h>
14 #include <linux/leds.h>
15 #include <linux/slab.h>
16 #include <linux/platform_device.h>
18 #include <linux/regmap.h>
19 #include <linux/platform_data/leds-lm355x.h>
46 /* register map info. */
47 struct lm355x_reg_data {
53 struct lm355x_chip_data {
55 enum lm355x_type type;
57 struct led_classdev cdev_flash;
58 struct led_classdev cdev_torch;
59 struct led_classdev cdev_indicator;
61 struct lm355x_platform_data *pdata;
62 struct regmap *regmap;
65 unsigned int last_flag;
66 struct lm355x_reg_data *regs;
69 /* specific indicator function for lm3556 */
70 enum lm3556_indic_pulse_time {
89 enum lm3556_indic_n_blank {
108 enum lm3556_indic_period {
119 #define INDIC_PATTERN_SIZE 4
126 /* indicator pattern data only for lm3556 */
127 static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {
128 [0] = {(INDIC_N_BLANK_1 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_1},
129 [1] = {(INDIC_N_BLANK_15 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_2},
130 [2] = {(INDIC_N_BLANK_10 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_4},
131 [3] = {(INDIC_N_BLANK_5 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_7},
134 static struct lm355x_reg_data lm3554_regs[REG_MAX] = {
135 [REG_FLAG] = {0xD0, 0xBF, 0},
136 [REG_TORCH_CFG] = {0xE0, 0x80, 7},
137 [REG_TORCH_CTRL] = {0xA0, 0x38, 3},
138 [REG_STROBE_CFG] = {0xE0, 0x04, 2},
139 [REG_FLASH_CTRL] = {0xB0, 0x78, 3},
140 [REG_INDI_CFG] = {0xE0, 0x08, 3},
141 [REG_INDI_CTRL] = {0xA0, 0xC0, 6},
142 [REG_OPMODE] = {0xA0, 0x03, 0},
145 static struct lm355x_reg_data lm3556_regs[REG_MAX] = {
146 [REG_FLAG] = {0x0B, 0xFF, 0},
147 [REG_TORCH_CFG] = {0x0A, 0x10, 4},
148 [REG_TORCH_CTRL] = {0x09, 0x70, 4},
149 [REG_STROBE_CFG] = {0x0A, 0x20, 5},
150 [REG_FLASH_CTRL] = {0x09, 0x0F, 0},
151 [REG_INDI_CFG] = {0xFF, 0xFF, 0},
152 [REG_INDI_CTRL] = {0x09, 0x70, 4},
153 [REG_OPMODE] = {0x0A, 0x03, 0},
156 static char lm355x_name[][I2C_NAME_SIZE] = {
157 [CHIP_LM3554] = LM3554_NAME,
158 [CHIP_LM3556] = LM3556_NAME,
161 /* chip initialize */
162 static int lm355x_chip_init(struct lm355x_chip_data *chip)
165 unsigned int reg_val;
166 struct lm355x_platform_data *pdata = chip->pdata;
168 /* input and output pins configuration */
169 switch (chip->type) {
171 reg_val = (u32)pdata->pin_tx2 | (u32)pdata->ntc_pin;
172 ret = regmap_update_bits(chip->regmap, 0xE0, 0x28, reg_val);
175 reg_val = (u32)pdata->pass_mode;
176 ret = regmap_update_bits(chip->regmap, 0xA0, 0x04, reg_val);
182 reg_val = (u32)pdata->pin_tx2 | (u32)pdata->ntc_pin |
183 (u32)pdata->pass_mode;
184 ret = regmap_update_bits(chip->regmap, 0x0A, 0xC4, reg_val);
194 dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
199 static int lm355x_control(struct lm355x_chip_data *chip,
200 u8 brightness, enum lm355x_mode opmode)
203 unsigned int reg_val;
204 struct lm355x_platform_data *pdata = chip->pdata;
205 struct lm355x_reg_data *preg = chip->regs;
207 ret = regmap_read(chip->regmap, preg[REG_FLAG].regno, &chip->last_flag);
210 if (chip->last_flag & preg[REG_FLAG].mask)
211 dev_info(chip->dev, "%s Last FLAG is 0x%x\n",
212 lm355x_name[chip->type],
213 chip->last_flag & preg[REG_FLAG].mask);
214 /* brightness 0 means shutdown */
221 regmap_update_bits(chip->regmap, preg[REG_TORCH_CTRL].regno,
222 preg[REG_TORCH_CTRL].mask,
224 << preg[REG_TORCH_CTRL].shift);
228 if (pdata->pin_tx1 != LM355x_PIN_TORCH_DISABLE) {
230 regmap_update_bits(chip->regmap,
231 preg[REG_TORCH_CFG].regno,
232 preg[REG_TORCH_CFG].mask,
234 preg[REG_TORCH_CFG].shift);
239 "torch brt is set - ext. torch pin mode\n");
246 regmap_update_bits(chip->regmap, preg[REG_FLASH_CTRL].regno,
247 preg[REG_FLASH_CTRL].mask,
249 << preg[REG_FLASH_CTRL].shift);
253 if (pdata->pin_strobe != LM355x_PIN_STROBE_DISABLE) {
254 if (chip->type == CHIP_LM3554)
259 regmap_update_bits(chip->regmap,
260 preg[REG_STROBE_CFG].regno,
261 preg[REG_STROBE_CFG].mask,
263 preg[REG_STROBE_CFG].shift);
268 "flash brt is set - ext. strobe pin mode\n");
274 regmap_update_bits(chip->regmap, preg[REG_INDI_CTRL].regno,
275 preg[REG_INDI_CTRL].mask,
277 << preg[REG_INDI_CTRL].shift);
281 if (pdata->pin_tx2 != LM355x_PIN_TX_DISABLE) {
283 regmap_update_bits(chip->regmap,
284 preg[REG_INDI_CFG].regno,
285 preg[REG_INDI_CFG].mask,
287 preg[REG_INDI_CFG].shift);
298 /* operation mode control */
299 ret = regmap_update_bits(chip->regmap, preg[REG_OPMODE].regno,
300 preg[REG_OPMODE].mask,
301 opmode << preg[REG_OPMODE].shift);
306 dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
312 static int lm355x_torch_brightness_set(struct led_classdev *cdev,
313 enum led_brightness brightness)
315 struct lm355x_chip_data *chip =
316 container_of(cdev, struct lm355x_chip_data, cdev_torch);
319 mutex_lock(&chip->lock);
320 ret = lm355x_control(chip, brightness, MODE_TORCH);
321 mutex_unlock(&chip->lock);
327 static int lm355x_strobe_brightness_set(struct led_classdev *cdev,
328 enum led_brightness brightness)
330 struct lm355x_chip_data *chip =
331 container_of(cdev, struct lm355x_chip_data, cdev_flash);
334 mutex_lock(&chip->lock);
335 ret = lm355x_control(chip, brightness, MODE_FLASH);
336 mutex_unlock(&chip->lock);
342 static int lm355x_indicator_brightness_set(struct led_classdev *cdev,
343 enum led_brightness brightness)
345 struct lm355x_chip_data *chip =
346 container_of(cdev, struct lm355x_chip_data, cdev_indicator);
349 mutex_lock(&chip->lock);
350 ret = lm355x_control(chip, brightness, MODE_INDIC);
351 mutex_unlock(&chip->lock);
355 /* indicator pattern only for lm3556*/
356 static ssize_t lm3556_indicator_pattern_store(struct device *dev,
357 struct device_attribute *attr,
358 const char *buf, size_t size)
361 struct led_classdev *led_cdev = dev_get_drvdata(dev);
362 struct lm355x_chip_data *chip =
363 container_of(led_cdev, struct lm355x_chip_data, cdev_indicator);
366 ret = kstrtouint(buf, 10, &state);
369 if (state > INDIC_PATTERN_SIZE - 1)
370 state = INDIC_PATTERN_SIZE - 1;
372 ret = regmap_write(chip->regmap, 0x04,
373 indicator_pattern[state].blinking);
377 ret = regmap_write(chip->regmap, 0x05,
378 indicator_pattern[state].period_cnt);
384 dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
388 static DEVICE_ATTR(pattern, S_IWUSR, NULL, lm3556_indicator_pattern_store);
390 static struct attribute *lm355x_indicator_attrs[] = {
391 &dev_attr_pattern.attr,
394 ATTRIBUTE_GROUPS(lm355x_indicator);
396 static const struct regmap_config lm355x_regmap = {
399 .max_register = 0xFF,
402 /* module initialize */
403 static int lm355x_probe(struct i2c_client *client,
404 const struct i2c_device_id *id)
406 struct lm355x_platform_data *pdata = dev_get_platdata(&client->dev);
407 struct lm355x_chip_data *chip;
411 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
412 dev_err(&client->dev, "i2c functionality check fail.\n");
417 dev_err(&client->dev, "needs Platform Data.\n");
421 chip = devm_kzalloc(&client->dev,
422 sizeof(struct lm355x_chip_data), GFP_KERNEL);
426 chip->dev = &client->dev;
427 chip->type = id->driver_data;
428 switch (id->driver_data) {
430 chip->regs = lm3554_regs;
433 chip->regs = lm3556_regs;
440 chip->regmap = devm_regmap_init_i2c(client, &lm355x_regmap);
441 if (IS_ERR(chip->regmap)) {
442 err = PTR_ERR(chip->regmap);
443 dev_err(&client->dev,
444 "Failed to allocate register map: %d\n", err);
448 mutex_init(&chip->lock);
449 i2c_set_clientdata(client, chip);
451 err = lm355x_chip_init(chip);
456 chip->cdev_flash.name = "flash";
457 chip->cdev_flash.max_brightness = 16;
458 chip->cdev_flash.brightness_set_blocking = lm355x_strobe_brightness_set;
459 chip->cdev_flash.default_trigger = "flash";
460 err = led_classdev_register((struct device *)
461 &client->dev, &chip->cdev_flash);
465 chip->cdev_torch.name = "torch";
466 chip->cdev_torch.max_brightness = 8;
467 chip->cdev_torch.brightness_set_blocking = lm355x_torch_brightness_set;
468 chip->cdev_torch.default_trigger = "torch";
469 err = led_classdev_register((struct device *)
470 &client->dev, &chip->cdev_torch);
472 goto err_create_torch_file;
474 chip->cdev_indicator.name = "indicator";
475 if (id->driver_data == CHIP_LM3554)
476 chip->cdev_indicator.max_brightness = 4;
478 chip->cdev_indicator.max_brightness = 8;
479 chip->cdev_indicator.brightness_set_blocking =
480 lm355x_indicator_brightness_set;
481 /* indicator pattern control only for LM3556 */
482 if (id->driver_data == CHIP_LM3556)
483 chip->cdev_indicator.groups = lm355x_indicator_groups;
484 err = led_classdev_register((struct device *)
485 &client->dev, &chip->cdev_indicator);
487 goto err_create_indicator_file;
489 dev_info(&client->dev, "%s is initialized\n",
490 lm355x_name[id->driver_data]);
493 err_create_indicator_file:
494 led_classdev_unregister(&chip->cdev_torch);
495 err_create_torch_file:
496 led_classdev_unregister(&chip->cdev_flash);
501 static int lm355x_remove(struct i2c_client *client)
503 struct lm355x_chip_data *chip = i2c_get_clientdata(client);
504 struct lm355x_reg_data *preg = chip->regs;
506 regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0);
507 led_classdev_unregister(&chip->cdev_indicator);
508 led_classdev_unregister(&chip->cdev_torch);
509 led_classdev_unregister(&chip->cdev_flash);
510 dev_info(&client->dev, "%s is removed\n", lm355x_name[chip->type]);
515 static const struct i2c_device_id lm355x_id[] = {
516 {LM3554_NAME, CHIP_LM3554},
517 {LM3556_NAME, CHIP_LM3556},
521 MODULE_DEVICE_TABLE(i2c, lm355x_id);
523 static struct i2c_driver lm355x_i2c_driver = {
528 .probe = lm355x_probe,
529 .remove = lm355x_remove,
530 .id_table = lm355x_id,
533 module_i2c_driver(lm355x_i2c_driver);
535 MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM355x");
536 MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
537 MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
538 MODULE_LICENSE("GPL v2");